knex: reference correct Promise implementation

knex/index.d.ts

@@ -7,6 +7,7 @@
 /// <reference types="node" />
 
 import * as events from "events";
+import * as Promise from "bluebird";
 
 type Callback = Function;
 type Client = Function;

knex/knex-tests.ts

@@ -1,5 +1,6 @@
 "use strict";
 import * as Knex from 'knex';
+import * as Promise from 'bluebird';
 import * as _ from 'lodash';
 
 // Initializing the Library